JP2010110115A - Electric motor with reduction gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve waterproof performance by suppressing water entering between an output shaft and an output shaft supporting part even if the tip side of the output shaft is positioned downward. <P>SOLUTION: The electric motor with a reduction gear includes a step surface 37c which extends in the direction crossing the axial line of an output shaft supporting shaft 37 to be arranged between a large diameter part 37a and a small diameter part 37b, with a cross angle being so formed as to be an acute angle toward the tip side of the output shaft supporting part 37, and a waterproof cap 39 equipped with a tubular part 40 having an abutment surface 40c which is engaged with the small diameter part 37b to contact the step surface 37c as well as a sliding part 41 which is provided to the other end side of the tubular part 40 to slide on an output shaft 16. With this configuration, it becomes hard for rain water W running the outer periphery of the output shaft supporting part 37 to enter between the tubular part 40 and the small diameter part 37b, thereby suppressing the rain water W from entering between the output shaft 16 and the output shaft supporting part 37 (bearing member 38), resulting in the improved waterproof performance of a wiper motor. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a motor with a speed reduction mechanism that includes a motor section having an armature and a speed reduction mechanism section that decelerates the rotation of the armature.

  2. Description of the Related Art Conventionally, a motor with a speed reduction mechanism has been used as an actuator for a vehicle-mounted device, and is often used in, for example, a power window device, a sunroof device, a slide door opening / closing device, and a wiper device. Among these, the motor with a speed reduction mechanism (wiper motor) that constitutes the wiper device is particularly installed in the engine room, and therefore is easily in contact with moisture such as rainwater. Therefore, in order to maintain the normal operation of the wiper motor for a long time, it is necessary to improve the waterproof performance of the wiper motor.

As such a wiper motor, for example, a technique described in Patent Document 1 is known. A vehicle wiper motor (motor with a speed reduction mechanism) described in Patent Document 1 includes a worm formed at the tip of an armature shaft (armature shaft) and a worm wheel meshing with the worm. (Deceleration mechanism part) is formed. The base end side of the output shaft is fixed to the worm wheel, and the output shaft is rotatably supported by a boss (output shaft support portion) of the gear case. The distal end side of the output shaft protrudes from the boss, and a seal member is mounted on the outer peripheral side of the boss. The seal member seals between the output shaft and the boss.
Japanese Utility Model Publication No. 62-6829 (Fig. 1)

  However, according to the motor with a speed reduction mechanism described in Patent Document 1 described above, since the seal member is fitted to the outer periphery of the straight output shaft support portion, the front end side of the output shaft faces the lower side of the vehicle. When mounted on a vehicle as described above, the following problems may occur. That is, moisture such as rain water that travels around the outer periphery of the output shaft support portion easily enters between the seal member and the output shaft support portion, and eventually moisture enters between the output shaft and the output shaft support portion. Problems such as the early deterioration of the grease applied between them occur. When the grease deteriorates, not only the rotational resistance of the output shaft increases, but also the output shaft becomes unevenly worn.

  The object of the present invention is to prevent moisture from entering between the output shaft and the output shaft support portion and improve the waterproof performance even when the front end side of the output shaft is directed downward. The object is to provide a motor with a speed reduction mechanism.

  The motor with a speed reduction mechanism of the present invention is a motor with a speed reduction mechanism including a motor portion having an armature and a speed reduction mechanism portion for reducing the rotation of the armature, and an output shaft provided in the speed reduction mechanism portion, A bottomed gear case that houses the speed reduction mechanism, an output shaft support that is provided at the bottom of the gear case, extends in the axial direction of the output shaft, and rotatably supports the output shaft, and the output shaft support portion A large-diameter portion provided on the base end side, a small-diameter portion provided on the distal end side of the output shaft support portion, the large-diameter portion and the small-diameter portion extending in a direction intersecting the axis of the output shaft support portion, A stepped surface that is set so that the crossing angle is equal to or less than a right angle toward the distal end side of the output shaft support portion, and a cylindrical shape that is fitted to the small diameter portion and has one end abutting against the stepped surface Part and the other end side of the cylindrical part Provided, characterized in that it comprises a sealing member having an output shaft and a sliding contact sliding portion.

  The motor with a speed reduction mechanism according to the present invention is characterized in that one end side of the cylindrical portion is formed in a shape along the step surface.

  The motor with a speed reduction mechanism of the present invention is characterized in that the outer diameter of the cylindrical portion is smaller than the outer diameter of the large diameter portion.

  According to the present invention, it extends in a direction intersecting with the axis of the output shaft support portion and is provided between the large diameter portion and the small diameter portion so that the intersecting angle is equal to or less than a right angle toward the distal end side of the output shaft support portion. A seal member having a set step surface, a cylindrical portion fitted to the small diameter portion and having one end abutting the step surface, and a sliding contact portion provided on the other end side of the cylindrical portion and slidably contacting the output shaft; It has. Therefore, it is difficult for moisture that travels around the outer periphery of the output shaft support portion to enter between the cylindrical portion and the small diameter portion, and as a result, moisture is prevented from entering between the output shaft and the output shaft support portion. The waterproof performance of the motor can be improved.

  According to the present invention, since the one end side of the cylindrical part is formed in a shape along the step surface, the one end side of the cylindrical part and the step surface can be brought into surface contact. Therefore, it is possible to improve the sealing performance between the one end side of the cylindrical portion and the step surface, and to further improve the waterproof performance of the motor with a speed reduction mechanism.

  According to the present invention, since the outer diameter dimension of the cylindrical portion is made smaller than the outer diameter dimension of the large diameter portion, the path of moisture along the outer periphery of the output shaft support portion is connected to one end side of the cylindrical portion and the step surface. Can be bent in between. Accordingly, it is possible to further suppress the ingress of moisture between the one end side of the cylindrical portion and the step surface, and to further improve the waterproof performance of the motor with the speed reduction mechanism.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

  1 is a front view showing a part of a vehicle equipped with the wiper motor according to the first embodiment, FIG. 2 is a front view showing the wiper motor of FIG. 1, and FIG. 3 is a structure showing an internal structure of the wiper motor of FIG. 4 is a partial cross-sectional view taken along the line AA in FIG. 2, FIG. 5 is an explanatory view for explaining a procedure for attaching the waterproof cap to the output shaft support portion, and FIG. 6 is an outer periphery of the output shaft support portion. The partial expanded sectional view of the broken-line circle | round | yen B part of FIG. 4 which shows the path | route of the rainwater which propagates is shown, respectively.

  As shown in FIG. 1, a wiper device 12 is mounted on the vehicle 10 in order to wipe off rainwater and the like adhering to the front window glass 11 to ensure the driver's field of view. The wiper device 12 includes two wiper arms 13 on the driver's seat side and the passenger seat side, and each wiper arm 13 is fixed to each wiper shaft 14 provided on the vehicle 10 at the base end side. Each of them is swingable around 14.

  In order to drive each wiper arm 13 in a swinging manner, the wiper device 12 is provided with a wiper motor 15 as a motor with a speed reduction mechanism. The wiper motor 15 is fixed in a cowl (not shown) in the engine room so that the output shaft 16 faces the lower side of the vehicle 10, and the output shaft 16 is connected to each wiper arm 13 via the link mechanism 17 and each wiper shaft 14. It is connected to the. When the wiper motor 15 is actuated, the rotational motion of the output shaft 16 is converted into a swing motion by the link mechanism 17 and transmitted to each wiper shaft 14, whereby each wiper arm 13 swings.

  A wiper blade 18 is attached to the distal end side of each wiper arm 13, and each wiper blade 18 is in elastic contact with the front window glass 11. When each wiper arm 13 is swung by the wiper motor 15, each wiper blade 18 is swung within a predetermined wiping range (a range indicated by a two-dot chain line in the figure) on the front window glass 11, thereby wiping the front window glass 11. can do.

  As shown in FIG. 2, the wiper motor 15 includes a motor unit 20 and a gear case unit 30. The yoke 21 that forms the outer shell of the motor unit 20 is formed in a bottomed cylindrical shape with one end opened, and a plurality of magnets 22 (only two are shown in the drawing) are mounted on the inside as shown in FIG. Has been. In addition, an armature 23 is rotatably provided inside each magnet 22 through a predetermined gap.

  An armature shaft 24 is fixed to the rotation center of the armature 23, and the armature shaft 24 rotates integrally with the rotation of the armature 23. A pair of worms 25 are integrally provided on the distal end side (left side in the drawing) of the armature shaft 24, and the twist directions of the worms 25 are opposite to each other. Further, a commutator 26 is integrally provided at a position near the armature 23 of the armature shaft 24, and a pair of brushes 27 are in sliding contact with the commutator 26. Thus, the wiper motor 15 is an electric motor with a brush, and is operated by a supply current supplied from a battery or the like (not shown) installed in the engine room or the like.

  The gear case portion 30 is formed in a hollow shape, and a reduction mechanism portion 31 is accommodated in the gear case portion 30 as shown in FIG. The speed reduction mechanism 31 includes worms 25 provided integrally with the armature shaft 24, a pair of counter gears 32 that mesh with the worms 25, and a spur gear 33 that meshes with each of the counter gears 32. .

  Each worm 25 is meshed with the first tooth portion 32a of each counter gear 32, and each counter gear 32 is rotated in the same direction (counterclockwise direction) with the rotation of the armature 23 as shown by the arrows in the figure. It is designed to rotate. Further, the tooth portion 33a of the spur gear 33 is meshed with the second tooth portion 32b of each counter gear 32, and the spur gear 33 rotates clockwise as the counter gear 32 rotates as indicated by the arrows in the figure. It is designed to rotate in the direction.

  As described above, the rotation of the armature 23 (armature shaft 24) is transmitted to the spur gear 33 in a decelerated state via the worms 25 and the counter gears 32, and the torque-enhanced output is thereby transmitted to the spur gear. The output shaft 16 is fixed at the rotation center 33.

  As shown in FIGS. 2 and 4, the gear case portion 30 includes an aluminum die-cast gear case 34 and a plastic resin gear cover 35 provided to cover the gear case 34. The gear case 34 is cast by pouring a molten aluminum material into a mold, and is formed in a bottomed shape having a bottom portion 34a. The gear cover 35 is processed by injection molding a molten plastic material, and is formed in a bottomed shape having a bottom portion 35a.

  The gear cover 35 is formed so that the shape of the opening side of the gear case 34 is substantially the same as the shape of the opening side of the gear case 34 so as to close the opening side of the gear case 34. And the hollow part 30a is formed in the inside of the gear case part 30 by assembling these. Further, by assembling the gear case part 30 and the motor part 20, the hollow part 30 a and the inside of the yoke 21 are communicated with each other.

  The connecting portion between the gear case 34 and the gear cover 35 and the connecting portion between the gear case 34 and the yoke 21 are sealed with each other by a seal member (not shown) such as an O-ring, and thereby, through the connecting portion. Ingress of rainwater or the like from the outside to the inside of the wiper motor 15 is prevented.

  As shown in FIG. 2, three attachment legs 34 b are integrally provided on the bottom 34 a of the gear case 34. A mounting bolt (not shown) is screwed to each mounting leg 34b, thereby fixing the wiper motor 15 to the vehicle 10 (see FIG. 1) via a mounting bracket 36 shown in FIG. It is like that.

  As shown in FIG. 4, an output shaft support portion 37 is integrally provided at a substantially central portion of the bottom portion 34a. The output shaft support portion 37 is configured to rotatably support the output shaft 16 fixed to the rotation center of the spur gear 33, is formed in a substantially cylindrical shape, and extends in the axial direction of the output shaft 16. Yes. The output shaft support portion 37 extends from the bottom 34 a toward the lower side in the figure, and the distal end side of the output shaft support portion 37 is located in the opening 36 a of the mounting bracket 36.

  A cylindrical bearing member 38 is mounted inside the output shaft support portion 37, and the output shaft support portion 37 supports the output shaft 16 through the bearing member 38 so as to be smoothly rotatable. Here, a predetermined amount of grease (not shown) is applied between the output shaft 16 and the bearing member 38 in order to ensure smooth rotation of the output shaft 16 with respect to the output shaft support portion 37.

  A large diameter portion 37 a is provided on the base end side of the output shaft support portion 37, that is, on the bottom portion 34 a side of the output shaft support portion 37. In addition, a small diameter portion 37b having a diameter smaller than that of the large diameter portion 37a is provided on the distal end side of the output shaft support portion 37, that is, on the side opposite to the bottom 34a side of the output shaft support portion 37. ing.

  Between the large diameter portion 37a and the small diameter portion 37b, an annular step surface 37c extending in a direction intersecting the axis C of the output shaft support portion 37 is provided. As shown in FIG. 5, the step surface 37 c is formed in a mortar shape whose center side is recessed toward the large diameter portion 37 a side (upper side in the drawing). That is, the intersecting angle of the step surface 37c with the axis C of the output shaft support portion 37 is such that the outer peripheral side of the step surface 37c is directed to the distal end side (small diameter portion 37b side) of the output shaft support portion 37, It is set to ° (about 75 °).

  A waterproof cap (seal member) 39 made of an elastic material such as rubber is attached to the small diameter portion 37 b of the output shaft support portion 37. The waterproof cap 39 includes a cylindrical portion 40 that is fitted to the small diameter portion 37 b and a sliding contact portion 41 that is provided integrally with the cylindrical portion 40 and has an inner peripheral side that is in sliding contact with the output shaft 16.

  A first lip portion 40 a and a second lip portion 40 b that are in contact with the outer periphery of the small diameter portion 37 b are formed on the inner peripheral side of the tubular portion 40. The inner diameter dimension of each lip portion 40a, 40b is set to be smaller than the outer diameter dimension of the small diameter portion 37b, whereby each lip portion 40a, 40b is in close contact with the small diameter portion 37b in an elastically deformed state. It is supposed to be. Here, as shown in FIG. 5, the inner diameter dimension of the first lip portion 40a is set to be larger than the inner diameter dimension of the second lip portion 40b, whereby the waterproof cap 39 has a small diameter portion 37b. Installation work can be done easily.

  The outer diameter dimension D1 of the cylindrical portion 40 is set smaller than the outer diameter dimension D2 of the large diameter portion 37a in the output shaft support portion 37 (D1 <D2), and the large diameter portion 37a and the cylindrical portion 40 are separated from each other. As shown in FIG. 6, a recess 42 is formed that is recessed radially inward from the large diameter portion 37 a toward the tubular portion 40.

  An annular contact surface 40 c that is formed in a shape along the step surface 37 c and that contacts the step surface 37 c is integrally provided on one end side (upper side in the drawing) of the cylindrical portion 40. The intersection angle of the contact surface 40c and the axis C of the output shaft support portion 37 is set to be an acute angle α °, as in the intersection angle of the step surface 37c, as shown in FIG. Thus, when the waterproof cap 39 is attached to the small diameter portion 37b, the stepped surface 37c and the contact surface 40c are brought into surface contact with each other so as to ensure a sufficient sealing property between them.

  On the other end side in the axial direction of the cylindrical portion 40 (lower side in the figure), the outer peripheral side of the sliding contact portion 41 formed in a substantially disc shape is integrally provided. On the inner peripheral side of the sliding contact portion 41, a two-stage lip portion 41a that is in sliding contact with the outer periphery of the output shaft 16 is integrally provided. The inner diameter dimension of the two-step lip portion 41a is set to be smaller than the outer diameter size of the output shaft 16, and the two-step lip portion 41a is in sliding contact with the output shaft 16 while being elastically deformed. This prevents rainwater or the like from entering between the bearing member 38 and the output shaft 16 from between the two-stage lip portion 41 a and the output shaft 16.

  In order to attach the waterproof cap 39 to the small diameter portion 37 b of the output shaft support portion 37, first, as shown in FIG. 5, the waterproof cap 39 and the contact surface 40 c of the tubular portion 40 are stepped surfaces of the output shaft support portion 37. In this state, the waterproof cap 39 is made to face the output shaft support portion 37. Next, the waterproof cap 39 is moved in the direction of the arrow in the figure under the state where the axis C of the output shaft support portion 37 and the axis C1 of the waterproof cap 39 are aligned. Then, the output shaft 16 enters the inside of the two-step lip portion 41a of the sliding contact portion 41 and comes into close contact therewith, and subsequently, the first lip portion 40a and the second lip portion 40b are attached to the small diameter portion 37b in this order. Is done. Thereafter, the contact surface 40c and the stepped surface 37c are brought into close contact with each other by pressing the waterproof cap 39 with a predetermined pressure, thereby completing the mounting of the waterproof cap 39 to the small diameter portion 37b of the output shaft support portion 37. To do.

  Next, the operation of the wiper motor 15 according to the first embodiment configured as described above will be described in detail with reference to the drawings. The wiper motor 15 is mounted on the vehicle 10 in the vertical position relationship shown in FIGS. 4 and 6.

  When the wiper motor 15 gets wet when the vehicle 10 travels in the rain, for example, the rain water (moisture) W travels through the gear cover 35 and the gear case 34 and travels around the output shaft support portion 37 as shown in FIG. Become. Then, the rainwater W reaches the outer periphery of the tubular portion 40 of the waterproof cap 39 from the outer periphery of the output shaft support portion 37 via the recess portion 42 as indicated by an arrow in the figure.

  At this time, the outer diameter dimension D1 of the cylindrical portion 40 is made smaller than the outer diameter dimension D2 of the large diameter portion 37a to form the recessed portion 42 so as to fold back the path of the rainwater W, and the step surface 37c and the contact surface 40c. And the stepped surface 37c of the output shaft support portion 37 and the abutting surface 40c of the waterproof cap 39 are brought into close contact with each other on the entire surface. Rainwater W does not stop around 42, and it is difficult for rainwater W to enter between the step surface 37c and the contact surface 40c.

  Therefore, the rainwater W that travels around the outer periphery of the output shaft support portion 37 does not enter between the tubular portion 40 and the small diameter portion 37b, and eventually the rainwater W enters between the output shaft 16 and the bearing member 38. Can be prevented. Thereby, it is possible to prevent the grease applied between the bearing member 38 and the output shaft 16 from being deteriorated or insufficient.

  The rainwater W traveling along the outer periphery of the tubular portion 40 then reaches the lower side of the waterproof cap 39 in the drawing, that is, the outer peripheral side of the sliding contact portion 41, and drains the cowl through the opening 36a of the mounting bracket 36. It is dropped toward the part (not shown).

  As described above in detail, according to the wiper motor 15 according to the first embodiment, the wiper motor 15 extends between the large-diameter portion 37a and the small-diameter portion 37b so as to extend in a direction intersecting the axis C of the output shaft support portion 37. A cylindrical portion having a step surface 37c set so that the crossing angle becomes an acute angle α ° toward the distal end side of the output shaft support portion 37, and a contact surface 40c fitted to the small diameter portion 37b and contacting the step surface 37c. 40 and a waterproof cap 39 provided on the other end side of the tubular portion 40 and provided with a sliding contact portion 41 that is in sliding contact with the output shaft 16.

  Therefore, the rainwater W traveling on the outer periphery of the output shaft support portion 37 is difficult to enter between the tubular portion 40 and the small diameter portion 37b, and as a result, between the output shaft 16 and the output shaft support portion 37 (bearing member 38). It is possible to improve the waterproof performance of the wiper motor 15 by suppressing the rainwater W from entering the vehicle.

  Moreover, according to the wiper motor 15 according to the first embodiment, the contact surface 40c of the cylindrical portion 40 is formed in a shape along the step surface 37c, so that the contact surface 40c and the step surface 37c are entirely covered. Can be contacted. Therefore, the sealing performance between the contact surface 40c and the step surface 37c can be improved, and the waterproof performance of the wiper motor 15 can be further improved.

  Furthermore, according to the wiper motor 15 according to the first embodiment, since the outer diameter dimension of the cylindrical portion 40 is smaller than the outer diameter dimension of the large diameter portion 37a, the rainwater W that travels around the outer periphery of the output shaft support portion 37. This path can be bent between the contact surface 40c and the step surface 37c via the recess 42. Therefore, the rainwater W can be further prevented from entering between the contact surface 40c and the step surface 37c, and the waterproof performance of the wiper motor 15 can be further improved.

  When the wiper motor 15 is mounted on the vehicle 10 such that the front end side of the output shaft 16 faces the upper side of the vehicle 10, a conventional normal waterproof cap is used instead of the waterproof cap 39 as described above. May be attached to the large-diameter portion 37 a of the output shaft support portion 37. That is, the gear case 34 can cope with both the case where the front end side of the output shaft 16 faces the lower side and the upper side of the vehicle 10.

  Next, a second embodiment of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected about the part which has the same function as 1st Embodiment mentioned above, and the detailed description is abbreviate | omitted.

  FIG. 7 is an enlarged partial sectional view showing the waterproof cap portion of the wiper motor according to the second embodiment.

  The wiper motor 15 according to the second embodiment is set to an outer diameter dimension larger than the outer diameter dimension D1 (see FIGS. 4 and 5) of the waterproof cap 39 as compared with the wiper motor 15 according to the first embodiment described above. The difference is that a waterproof cap (seal member) 50 is provided.

  The waterproof cap 50 includes a cylindrical portion 51 and a sliding contact portion 41, and the outer diameter dimension D3 of the cylindrical portion 51 is set larger than the outer diameter dimension D2 of the large diameter portion 37a in the output shaft support portion 37. (D3> D2). On one end side (upper side in the drawing) of the cylindrical portion 51, a contact surface 40c and an inclined surface 51a extending radially outward from the contact surface 40c are provided. The intersection angle of the inclined surface 51a with the axis C of the output shaft support portion 37 is set to be an acute angle α °, similar to the intersection angle of the step surface 37c and the contact surface 40c.

  As shown by the arrow in FIG. 7, the rainwater W that travels along the outer periphery of the output shaft support portion 37 reaches the outer periphery of the cylindrical portion 51 from the outer periphery of the output shaft support portion 37 via the inclined surface 51 a. At this time, since the inclined surface 51a is inclined at an acute angle α °, the rainwater W flows down along the inclined surface 51a without stopping around the one end side of the cylindrical portion 51, and the step surface 37c and the contact surface 40c It is difficult to enter between.

  Also in the wiper motor 15 according to the second embodiment configured as described above, the waterproof performance of the wiper motor 15 is suppressed by preventing the rainwater W from entering between the output shaft 16 and the output shaft support portion 37 (bearing member 38). Can be improved.

  Next, a third embodiment of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected about the part which has the same function as 1st Embodiment mentioned above, and the detailed description is abbreviate | omitted.

  FIG. 8 is an enlarged partial sectional view showing a waterproof cap portion of the wiper motor according to the third embodiment.

  The wiper motor 15 according to the third embodiment has an intersection angle between the step surface 37c and the contact surface 40c with the axis C of the output shaft support portion 37 as compared with the wiper motor 15 according to the first embodiment described above. The point set to the right angle (90 °) is different. Also in the wiper motor 15 according to the third embodiment configured as described above, the waterproof performance of the wiper motor 15 is suppressed by preventing rain water W from entering between the output shaft 16 and the output shaft support portion 37 (bearing member 38). Can be improved.

  Further, according to the wiper motor 15 according to the third embodiment, since the intersecting angle between the step surface 37c and the contact surface 40c and the axis C of the output shaft support portion 37 is set to be a right angle, the output shaft support portion 37 and The waterproof cap 39 can be easily formed.

  It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. For example, in each of the above embodiments, the intersecting angle of the step surface 37c and the contact surface 40c with the axis C of the output shaft support portion 37 is set to the same intersecting angle (in the first and second embodiments, an acute angle). Although α °, a right angle in the third embodiment) is shown, the present invention is not limited to this.

  For example, the intersection angle of the step surface 37c is an acute angle α °, and the intersection angle of the contact surface 40c is an acute angle β ° that is tighter than the acute angle α ° (β ° <α °), or an acute angle γ that is looser than the acute angle α °. It is also possible to set it to ° (γ °> α °). Alternatively, the crossing angle of the stepped surface 37c may be a right angle, and the crossing angle of the contact surface 40c may be an acute angle α °, an acute angle β °, or an acute angle γ °. In short, when the waterproof cap 39 (50) is attached to the small diameter portion 37b of the output shaft support portion 37, the stepped surface 37c and the contact surface 40c are brought into close contact with each other, and sufficient sealing performance can be obtained between them. It ’s good.

  In each of the above embodiments, the wiper motor as a motor with a speed reduction mechanism is applied to the wiper device 12 for wiping the front window glass 11. However, the present invention is not limited to this, and the rear window glass is used. The present invention can also be applied to a wiper device for wiping.

  Further, in each of the above embodiments, the motor applied to the wiper motor 15 as a motor with a speed reduction mechanism has been shown. However, the present invention is not limited to this, and other motors having a speed reduction mechanism such as a power window device and a slide door opening / closing device. It can also be applied to a motor with a speed reduction mechanism.

  In each of the above embodiments, a motor with a brush is used as a motor with a speed reduction mechanism. However, the present invention is not limited to this and can be applied to a brushless motor or the like.

It is a front view showing a part of vehicles carrying a wiper motor concerning a 1st embodiment. It is a front view which shows the wiper motor of FIG. FIG. 3 is a structural diagram showing an internal structure of the wiper motor of FIG. 2. It is a fragmentary sectional view which follows the AA line of FIG. It is explanatory drawing explaining the installation procedure to the output-shaft support part of a waterproof cap. It is a partial expanded sectional view of the broken-line circle | round | yen B part of FIG. 4 which shows the path | route of the rainwater which propagates the outer periphery of an output-shaft support part. It is a partial expanded sectional view which expands and shows the waterproof cap part of the wiper motor which concerns on 2nd Embodiment. It is a partial expanded sectional view which expands and shows the waterproof cap part of the wiper motor which concerns on 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle 11 Front window glass 12 Wiper apparatus 13 Wiper arm 14 Wiper shaft 15 Wiper motor (motor with reduction mechanism)
16 Output shaft 17 Link mechanism 18 Wiper blade 20 Motor part 21 Yoke 22 Magnet 23 Armature 24 Armature shaft 25 Worm (deceleration mechanism part)
26 Commutator 27 Brush 30 Gear case part 30a Hollow part 31 Reduction mechanism part 32 Counter gear (reduction mechanism part)
32a 1st tooth part 32b 2nd tooth part 33 Spur gear (reduction mechanism part)
33a Tooth part 34 Gear case 34a Bottom part 34b Mounting leg part 35 Gear cover 35a Bottom part 36 Mounting bracket 36a Opening part 37 Output shaft support part 37a Large diameter part 37b Small diameter part 37c Step surface 38 Bearing member 39 Waterproof cap (seal member)
40 cylindrical portion 40a first lip portion 40b second lip portion 40c contact surface 41 sliding contact portion 41a two-step lip portion 42 recess portion 50 waterproof cap (seal member)
51 cylindrical part 51a inclined surface D1-D3 outer diameter W rain water (moisture)

Claims (3)

A motor with a speed reduction mechanism comprising a motor portion having an armature and a speed reduction mechanism portion for reducing the rotation of the armature,
An output shaft provided in the speed reduction mechanism,
A bottomed gear case that houses the speed reduction mechanism,
An output shaft support provided on the bottom of the gear case, extending in the axial direction of the output shaft and rotatably supporting the output shaft;
A large diameter portion provided on the proximal end side of the output shaft support portion;
A small diameter portion provided on the distal end side of the output shaft support portion;
It extends in a direction intersecting with the axis of the output shaft support portion and is provided between the large diameter portion and the small diameter portion, and the intersection angle is set to be equal to or less than a right angle toward the tip side of the output shaft support portion. Stepped surface,
A cylindrical portion that is fitted to the small diameter portion and has one end abutting against the step surface, and a seal member that is provided on the other end of the cylindrical portion and has a sliding contact portion that is in sliding contact with the output shaft. A motor with a speed reduction mechanism.   2. The motor with a speed reduction mechanism according to claim 1, wherein one end side of the cylindrical portion is formed in a shape along the step surface.   3. The motor with a speed reduction mechanism according to claim 1, wherein an outer diameter of the cylindrical portion is smaller than an outer diameter of the large diameter portion.

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